code: def test_given_no_pwd_file_expect_empty_credentials_list(self):
      self._set_file(
          self.config_file.name,
          "[TabPy]\n" "TABPY_TRANSFER_PROTOCOL = http",
      )
  
      app = TabPyApp(self.config_file.name)
      self.assertDictEqual(
          app.credentials,
          {},
          "Expected no credentials with no password file provided",
      )
  
file_path: TabPy/tests/unit/server_tests/test_pwd_file.py
imports: import os
  import unittest
  from tempfile import NamedTemporaryFile
  from tabpy.tabpy_server.app.app import TabPyApp
label_desc: Use image node_id 4 for calling the TestPasswordFile obj's underlying member method code with example usage: obj.test_given_no_pwd_file_expect_empty_credentials_list() without return types